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Method and equipment for grease purification

a technology for purifying methods and equipment, applied in the field of grease purification, can solve the problems of grease loss, limited use of this technology, and high water consumption, so as to improve the temperature of crude grease, reduce environmental pollution, and avoid fossil energy consumption

Inactive Publication Date: 2021-06-03
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure provides a method for purifying grease by using solar energy to provide heat. This method helps to obtain high purity fatty acids and glycerin as a co-product, and collects high value-added nutrients from the grease. This improves the use value of grease.

Problems solved by technology

As to the solvent extraction and separation technology, since large energy consumption is needed during separation of extractant and grease, and solvent volatilization will lead to environmental pollution, the use of this technology is limited.
If the high-temperature washing technology is used, salt and other substances which are soluble in water can be easily removed, but water consumption is rather high due to low water solubility of vitamin, sterol, and pigment.
As a result, not only grease will lose, but also a large amount of waste water will be generated during this process.
These technologies have high efficiencies, but have high costs.
There are technical and economic restrictions for large-scale use of these technologies.
Besides, oxygen in the glyceride will consume hydrogen to generate water so as to be removed during hydrogenation process, and hydrogen consumption is relatively high.

Method used

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  • Method and equipment for grease purification

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embodiment 1

[0038]A method for purifying waste grease (the waste grease has an unsaturated fatty acid content in a range from 7% to 15%, and is a low unsaturated fatty acid contained grease) and producing fatty acid, as well as glycerin and nutrients as co-products using solar energy. The method comprises following steps. Before waste grease purification, a N2 replacement system is used to remove the influence of oxygen on hydrolysis reaction. The waste grease exchanges heat with aqueous phase discharged from a grease hydrolysis column, and is fed into the grease hydrolysis column. Operating conditions of the grease hydrolysis column are: a pressure being in a range from 4.5 MPa to 5.0 MPa, and a temperature being 280° C. A mass ratio of the crude grease to the aqueous phase fed into the grease hydrolysis column is 1:3, and a total mass space velocity of the crude grease and the aqueous phase fed into the grease hydrolysis column is 0.5 W−1. In the grease hydrolysis column, the crude grease is ...

embodiment 2

[0040]A method for purifying microalgae grease (the microalgae grease has an unsaturated fatty acid content in a range from 20% to 30%, and is a high unsaturated fatty acid contained grease) and producing fatty acid, as well as glycerin and nutrients as co-products using solar energy. The method comprises following steps. Before microalgae grease purification, a N2 replacement system is used to remove the influence of oxygen on hydrolysis reaction. The microalgae grease exchanges heat with aqueous phase discharged from a grease hydrolysis column, and is fed into the grease hydrolysis column. Operating conditions of the grease hydrolysis column are: a pressure being in a range from 2.5 MPa to 3.0 MPa, and a temperature being 210° C. A mass ratio of the crude grease to the aqueous phase fed into the grease hydrolysis column is 1:3, and a total mass space velocity of the crude grease and the aqueous phase fed into the grease hydrolysis column is 0.75 h−1. In the grease hydrolysis colum...

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Abstract

A method for grease purification is disclosed. The method comprises steps of: S1, feeding crude grease into a grease hydrolysis column to be hydrolysed so as to obtain aqueous phase, organic phase, and middle layer substances between the aqueous phase and the organic phase; S2, feeding the organic phase and the middle layer substances in the grease hydrolysis column into a flash stripping column to be flashed so as to obtain vaporized products and non-vaporized products; and S3, feeding the vaporized products in the flash stripping column into a separation column to be separated so as to obtain fatty acid. By this method, fatty acid with a high purity can be obtained; glycerin can be obtained as a co-product; and high value-added nutrients in the grease can be collected. Therefore, the use value of grease can be greatly improved.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the priority of Chinese patent application CN201710872768.1, entitled “Method and Equipment for Grease Purification” and filed on Sep. 25, 2017, the entirety of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present disclosure relates to the technical field of grease purification, and particularly to a grease purification method through hydrolysis, flash evaporation, and separation steps and equipment used in the method. Fatty acid with a high purity can be produced, and glycerin, as well as sterol, vitamin, pigment, unsaturated fatty acid and other nutrients can be produced as co-products by this method.BACKGROUND OF THE INVENTION[0003]Bio-grease (including animal grease and vegetable grease) mainly contains glyceride, and also contains glycolipid, phospholipid, sterol, vitamin, and pigment (which mainly exists in vegetable grease). Waste grease not only contains the aforementione...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C11C1/04F24S10/30F24S20/20
CPCC11C1/04F24S20/20F24S10/30C11C1/10F24S90/00C11B13/00Y02E10/44Y02W30/74C10G2300/1014C10G2300/1018C10N2050/10C10M2207/125C10M175/0083
Inventor LIU, ZIYUYANG, XIAOYI
Owner BEIHANG UNIV